CoO 



EEPORT 1863. 



236. Leptochiton nexus, n. s. Like aseUus : scarcely sculptured : mautle-maTtpn witli 



striated chaffy scales^ like 3Iagdalensis, interspersed witli transparent needles. 

 20-80 fin. Cp. 



237. Acanthochites avicula, n. a. Like arragonites, but valves sculptured in large 



snake-skin pattern. 8-20 fin. r. Cp, 



Family Patellida. 

 Nacella instabUis, Gld. E.E. Large : sbape of compressa, 

 Kacella incessa, Hds. Sulphur. Small : Aucyloid. 

 H Nacella suhspiralis, n. a. Shaped like Emarijinula rosea, and may be a Scutel- 



Una. 10-20 fin. Cp. 

 Nacella depicta, Hds. Sulphur. Small, long, flat, smooth : colour in rays. 

 Nacella paleacea, Gld. Otia. Narrower, brown, striated at each end. 

 242 J. Nacella ?YSLr. triangularis. Shorter: apex raised: scarcely stiiated : whitisbj 

 with brown spots. 



238. 

 240. 



241. 



242. 



Family Acmeeidce. (For synonyms, v. Reports in locis.') 



243. Acmaa patina, Esch. Large, blackish or tessellated : with very fine distant 



strise. Between tides, Lord. 



244. Acmma pelta, Esch. Moj'B conical; border narrow; smooth, with blunt ribs 



often obsolete. Between tides. Lord. 



2446. Acmcea ?var. Asrm, Midd. Stout, small, black, conical. Probably an ab- 

 normal growth oipelta, jun. (1 sp. beginning on pelta) Cp. 



Llo. Actneea persona, Esch. Smaller: apex posterior: colour blotched or treckled : 

 sculpture in irregular ribs. Maz. Cat. no. 206. Vai-. umbonata, arched, with 

 narrow distant ribs. Var. digitalis, ape.x near margin. Var. textilis, apex far 

 fi'om margin, ajpproaching pelta. 



246. Acmtsa seabra, Niitt. Eve. Outside mth close rows of fine granules : orange- 



red tint, glossy. Var. limatula, sculptiure stronger, border black : perLaps= 

 Maz. Cat. no. 265. 



247. Acmcea spectrum, Nutt. Eve. Flattened, with ven' sti'ong ribs, irregular. 



248. Acmcea {^ pileolus, Midd. var.) rosacea. Pink, smal'l : Uke Herm specimens of 



mrginea. 



249. Lattia gigantea. Gray. Genus reconstituted : mantle with papiUse interrupted 



in fi-on't. Shell large, flat, dark, lustrous (= Tecturella grandis, Smiths. Inst. 

 Check List). 



250. Scurria mitra, Esch. Papilte all round the mantle. White, conical : younf 



sometimes faintly sculptu)-ed. In dead clam, 12 fm. Lord. 

 £50 b. Scurria ?var. ftmiculata, With roiinded riblets^ somewhat noduloua. 



136 



